Physical Science Semester 2

According to Newton’s law of universal gravitation, which statement is true?

• Lighter objects experience a higher acceleration than heavier objects.

• Falling objects accelerate as they approach the ground.

• The weight of an object increases as it moves away from the ground.

• Lighter objects experience a lower acceleration than heavier objects.

• The mass of an object increases as it moves closer to the ground.

A silver coin rubs vigorously against a wool cloth. The cloth becomes positively charged. Which statements are true?

• The silver coin lost electrons.

• The silver coin gained electrons.

• The wool cloth lost electrons.

• The wool cloth gained protons.

• The wool cloth lost protons.

Jeff puts on a leather jacket over his sweater. The sweater becomes negatively charged. Which statements about Jeff’s situation are true?

• The sweater has a tendency to repel electrons.

• The sweater has a tendency to attract protons.

• The leather jacket has a tendency to attract electrons.

• The leather jacket has a tendency to attract protons.

• The leather jacket has a lower tendency to repel electrons than the sweater.

Which circuits are parallel circuits?

• 
• 
• 
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Which two statements are true about all generators?

• They convert motion energy to electric energy.

• They have a fixed pair of magnets and a rotating metal coil.

• They’re powered by fossil fuels.

• They convert electric energy to motion energy.

• They use the relative motion of a magnet and a coil of wire.

Which two statements about an electric motor are true?

• It converts motion energy to electric energy.

• It depends on the relative motion of a magnet and a current-carrying wire.

• It depends on a rotating magnet to create a magnetic field.

• It converts electric energy to motion energy.

• It doesn’t require electricity because it uses electromagnetism.

Robert is hosting a backyard barbecue. He uses a charcoal fire to grill the chicken. The chicken cooks, but it never touches the fire directly. What energy transformation occurs as the chicken cooks?

• chemical potential energy → radiant energy → thermal energy

• thermal energy → chemical potential energy → motion energy

• chemical potential energy → electric potential energy

• motion energy → chemical potential energy → motion energy

• radiant energy → electric potential energy → chemical potential energy

Jay bought a toy car. To make the car move, he must turn a key attached to a spring. Turning the key winds the spring tight. The toy car moves when the key is released and the spring unwinds. What’s the main transformation of energy in this example?

• chemical energy to electric energy

• chemical energy to motion energy

• electric energy to motion energy

• electric energy to potential energy

• potential energy to motion energy

Which object has the least amount of kinetic energy?

• a car driving down a road

• a soccer ball rolling down a hill

• a bicycle locked to a bike rack

• a satellite orbiting Earth

Which two statements are true about energy transformations?

• Energy is never released from an object as heat.

• Energy is never transformed between kinetic energy and potential energy.

• Energy is never created.

• Energy is never completely transformed.

• Energy is never destroyed.